/** \example datastore_iterators.cpp
 * Iterator-base data Management in JKQTPDatastore.
 *
 * \ref JKQTPlotterBasicJKQTPDatastoreIterators
 */
 
#include <QApplication>
#include "jkqtplotter/jkqtplotter.h"
#include "jkqtplotter/graphs/jkqtpscatter.h"
#include "jkqtplotter/graphs/jkqtpimage.h"
#include <algorithm>

int main(int argc, char* argv[])
{
    QApplication app(argc, argv);

    // 1. create a plotter window and get a pointer to the internal datastore (for convenience)
    JKQTPlotter plot;
    JKQTPDatastore* datastore=plot.getDatastore();

    JKQTPXYLineGraph* linegraph;


    // 2. now we create a cos-curve plot with the standard means of JKQTPDatastore::addColumn(NRows, "name")
    //    and JKQTPDatastore::set() to actually set the values:
    //size_t XCol=datastore->addLinearColumn(50, 0, 4.0*JKQTPSTATISTICS_PI, "cos curve: x-data");
    //size_t YCol=datastore->addColumn(datastore->getRows(XCol), "cos curve: y-data");
    //for (size_t i=0; i<datastore->getRows(XCol); i++) {
    //    datastore->set(YCol, i, cos(datastore->get(XCol, i)));
    //}
    // 2.1. the for-loop above can also be expressed in terms of (random-access) iterators:
    //auto itY=datastore->begin(YCol);
    //for (auto itX=datastore->begin(XCol); itX!=datastore->end(XCol); ++itX, ++itY) {
    //    *itY=cos(*itX);
    //}
    // 2.2 with backInserter() you can generate an object liek a std::back_inserter, which
    //     removes the requirement to pre-allocate the columns:
    size_t XCol=datastore->addColumn("cos curve: x-data");
    size_t YCol=datastore->addColumn("cos curve: y-data");
    auto biXCol=datastore->backInserter(XCol);
    auto biYCol=datastore->backInserter(YCol);
    for (double x=0; x<4.0*JKQTPSTATISTICS_PI; x+=4.0*JKQTPSTATISTICS_PI/50.0) {
        *biXCol=x;
        *biYCol=cos(x);
        ++biXCol;
        ++biYCol;
    }
    // 2.3 combining with addLinearColumn() you can also use C++ STL algorithms:
    //size_t XCol=datastore->addLinearColumn(50, 0, 4.0*JKQTPSTATISTICS_PI, "cos curve: x-data");
    //size_t YCol=datastore->addColumn("cos curve: y-data");
    //std::transform(datastore->begin(XCol), datastore->end(XCol), datastore->backInserter(YCol), cos);
    // 2.4. Just for fun we can now sort the data:
    //std::sort(datastore->begin(YCol), datastore->end(YCol));
    //      or replace any value <-0.5 with 1:
    //std::replace_if(datastore->begin(YCol), datastore->end(YCol), [](double v) { return v<-0.5; }, 1.0);
    // 2.5. Also the erase-remove idiom is supported:
    //datastore->eraseFromColumn(std::remove_if(datastore->begin(YCol), datastore->end(YCol), [](double v) { return v<0; }), datastore->end(YCol));


    plot.addGraph(linegraph=new JKQTPXYLineGraph(&plot));
    linegraph->setXColumn(XCol);
    linegraph->setYColumn(YCol);
    linegraph->setTitle(QObject::tr("cosine graph"));


    // 6. autoscale the plot so the graph is contained
    plot.zoomToFit();

    // show plotter and make it a decent size
    plot.show();
    plot.resize(600,400);

    return app.exec();
}
